Directivity of Interplanetary Type III Radio Bursts

Other

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

7519 Flares, 7534 Radio Emissions, 7847 Radiation Processes

Scientific paper

Type III radio bursts are produced by the energetic electrons accelerated by solar flares. The partial conversion of Langmuir waves excited by these electrons into escaping radiation at the fundamental and second harmonic of the electron plasma frequency, fpe is believed to be the emission mechanism for these bursts. The directivity patterns of the electromagnetic waves are the functions of the direction of observation. For example, the fundamental emission is highly directive and beamed with half angle sin-1μ around the ambient magnetic field, where μ is the refractive index. On the other hand, we show that the directivity pattern of second harmonic emission consists of four symmetric lobes, separated from each other by 60 degrees both in the presence as well as in the absence of ambient magnetic field. We present the simultaneous observations of type III radio bursts from the Ulysses and Wind spacecraft situated at two different, widely separated locations to investigate the angular dependence of the intensity and of the time profiles of type III radio bursts. Most of the bursts are observed by both the spacecraft, even when one spacecraft was on the opposite side of the Sun from the other. We show that the ratio of intensities measured at the peak of the events (directivity factor), and the time profiles in both directions of observation are consistent with the computed primary directivity pattern of the radiating sources.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Directivity of Interplanetary Type III Radio Bursts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Directivity of Interplanetary Type III Radio Bursts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Directivity of Interplanetary Type III Radio Bursts will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1723267

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.